ETC PT7A4402L

Data Sheet
PT7A4402B/4402L
T1/E1 System Synchronizer
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Features
Introduction
• Supports AT&T TR62411 Stratum 3, 4 and
PT7A4402B/4402L employs a digital phase-locked
•
•
Stratum 4 Enhanced for DS1 interfaces and for
loop (DPLL) to provide timing and synchronizing
ETSI ETS 300 011, TBR 4, TBR 12, and TBR
signals for multitrunk T1 and E1 primary rate
13 for E1 interfaces
transmission links. The ST-BUS clock and framing
Provides C1.5, C3, C2, C4, C8 and C16 output
signals are phase-locked to input reference signals
clock signals
of either 2.048 MHz, 1.544MHz or 8 kHz.
Provides three kinds of 8kHz ST-BUS framing
signals
The PT7A4402B/4402L meets the requirements for
•
Two independent reference inputs
AT&T TR62411 Stratum 3, 4 and Stratum 4 En-
•
Input reference frequency 1.544MHz, 2.048MHz
hanced, and ETSI ETS 300 011 in jitter tolerance,
or 8kHz selectable
jitter transfer, intrinsic jitter, frequency accuracy, hold-
Provides bit error free reference switching and
over accuracy, capture range, phase slope and MTIE,
meets phase slope and MTIE requirements
etc.
•
•
Normal, Holdover or Free-Run operating modes
available
The PT7A4402B/4402L operates in Manual or Au-
•
Automatic reference input impairment monitor
tomatic Mode, and in each of the modes, three oper-
•
Power supply: 5V (4402B) and 3.3V(4402L)
ating states are available: Normal, Holdover and FreeRun.
Applications
Ordering Information
• Synchronization and timing control for multitrunk
Pa r t Nu mb er
T1 and E1 systems
Pa ck a ge
•
ST-BUS clock and frame pulse sources
PT7A 4402BJ
28-Pin PLCC
•
Primary Trunk Rate Converters
PT7A4402LJ
28-Pin PLCC
PT0100(08/02)
1
Ver:0
Data Sheet
PT7A4402B/4402L
T1/E1 System Synchronizer
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Contents
Features ....................................................................................................................................................... 1
Applications ................................................................................................................................................ 1
Introduction ................................................................................................................................................. 1
Ordering Information .................................................................................................................................. 1
Block Diagram ............................................................................................................................................ 3
Pin Information ........................................................................................................................................... 4
Pin Assignment ..................................................................................................................................... 4
Pin Configuration ................................................................................................................................. 4
Pin Description ..................................................................................................................................... 5
Functional Description ................................................................................................................................ 7
Overall Operation ................................................................................................................................. 7
Modes and States of Operation ........................................................................................................... 10
Applications Information .................................................................................................................... 14
Detailed Specifications .............................................................................................................................. 16
Definitions of Critical Performance Specifications ............................................................................. 16
Absolute Maximum Ratings ............................................................................................................... 18
Recommended Operating Conditions ................................................................................................. 18
DC Electrical and Power Supply Characteristics ................................................................................ 19
AC Electrical Characteristics .............................................................................................................. 20
Mechanical Specifications ......................................................................................................................... 33
Note .......................................................................................................................................................... 34
PT0100(08/02)
2
Ver:0
Data Sheet
PT7A4402B/4402L
T1/E1 System Synchronizer
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Block Diagram
Figure 1. Block Diagram
RST
OSCi
OSCo
PRI
SEC
TCLR
Master
Clock
TIE
Corrector
VCC
Virtual
Reference
DPLL
State
Select
State
Select
Reference
Select MUX
PT0100(08/02)
Guard
Time
Circuit
Mode/State
Control Machine
MS1
Output
Interface
Circuit
Input
Impairment
Monitor
TIE
Correct
Enable
RSEL
LOS1
LOS2
GND
MS2
GTo
3
GTi
C1.5
C2
C3
C4
C8
C16
F0
F8
F16
Feedback
Frequency
Select MUX
FS1
FS2
Ver:0
Data Sheet
PT7A4402B/4402L
T1/E1 System Synchronizer
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Pin Information
Pin Assignment
Table 1. Pin Assignment
G r ou p
Symb ol
F u n ct ion
Chip Clock
OSCi, OSCo
Clock
Power & Ground
VCC, GND
Power
Clock and Framing Outputs
C1.5, C3, C2, C4, C8, C16, F0, F8, F16
Clock and Framing Signals
Control Signals
RSEL, LOS1, LOS2, MS1, MS2, GTi,
GTo, FS1, FS2, RST, TCLR
Control
Reference Inputs
PRI, SEC
Reference Clock
Pin Configuration
4
VCC
OSCo
OSCi
F16
F0
F8
C1.5
3
2
FS2
PRI
SEC
TCLR
GND
RST
FS1
Figure 2. Pin Configuration
1 28 27 26
5
25
6
24
7
8
23
28-Pin PLCC
22
9
21
10
20
11
19
RSEL
MS1
MS2
LOS1
LOS2
GTo
GTi
VCC
C3
C2
C4
GND
C8
C16
12 13 14 15 16 17 18
Top View
PT0100(08/02)
4
Ver:0
Data Sheet
PT7A4402B/4402L
T1/E1 System Synchronizer
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Pin Description
Table 2. Pin Description
P in
Na m e
Typ e
1, 15
GND
Ground
2
TCLR
I
T I E cir cu it r eset (T T L ): A low level on this pin will reset the TIE circuit, re-aligning
the output signals with the input signal. TCLR must be active (low) for at least 300ns.
This pin is internally pulled down to GND.
3
SEC
I
Secon d a r y r efer en ce (T T L ): One of two independent input reference signals, internally
pulled down to GND.
4
PRI
I
P r im a r y r efer en ce (T T L ): The other independent reference signal, internally pulled
down to GND.
5, 18
VCC
Power
6
OSCo
O
O scilla t or m a st er clock ou t p u t (C MO S): Output of 20MHz master clock
7
OSCi
I
O s c i l l a t o r m a s t e r c l o c k i n p u t ( C M O S ) : I n p u t o f 2 0 MH z m a s t e r c l o c k ( c a n b e
connected directly to a clock source)
8
F16
O
F r a m e p u lse ST-BUS 16.384Mb /s (C MO S): 8kHz frame signal with 61ns low level
pulse that marks the beginning of a ST-BUS frame
9
F0
O
F r a m e p u lse ST-BUS 2.048 Mb /s (C MO S): 8kHz frame signal with 244ns low level
pulse that marks the beginning of a ST-BUS frame
10
F8
O
F r a m e p u lse ST-BUS 8.192 Mb /s (C MO S): 8kHz frame signal with 122ns high level
pulse that marks the beginning of a ST-BUS frame
11
C1.5
O
1.544 MH z clock (C MO S): This output is used in T1 applications.
12
C3
O
3.088 MH z clock (C MO S): This output is used in T1 applications.
13
C2
O
2.048 MH z clock (C MO S): This output is used for ST-BUS operation at 2.048Mb/s.
14
C4
O
4.096 MH z clock (C MO S): This output is used for ST-BUS operation at 2.048Mb/s
and 4.096Mb/s.
PT0100(08/02)
Descr ip t ion
G r ou n d (0V)
Power su p p ly +5V for 4402B a n d +3.3V for 4402L
5
Ver:0
Data Sheet
PT7A4402B/4402L
T1/E1 System Synchronizer
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Table 2. Pin Description (continued)
P in
Na m e
Typ e
Descr ip t ion
16
C8
O
8.192 MH z clock (C MO S): This output is used for ST-BUS operation at 8.192Mb/s.
17
C16
O
16. 384 M H z cl ock ( C M O S) : Thi s out put i s used f or ST- BUS oper at i on wi t h a
16.384MHz clock.
19
GTi
I
G u a r d Tim e (Sch m it t in p u t ): The signal at this pin is used by the device’s state machine
in both Manual and Automatic modes to effect the TIE function and the state changes
between Primary Holdover and Primary Normal, and Primary Holdover and Secondary
Normal. Refer to Tables 6 and 7. The signal at this pin is clocked in by the rising edge
of F8.
20
GTo
O
G u a r d Tim e (C MO S): The LOS1 input is clocked in by the rising edge of F8, then
buffered and sent to GTo when in Automatic Mode. This pin is typically used to drive
GTi input through an RC circuit.
21
LOS2
I
Secon d a r y R efer en ce L oss (T T L ): This pin is normally connected to an external source
that applies high logic level whenever the secondary reference signal is lost or invalid.
The existing level at this pin is clocked in by the rising edge of F8. This pin is internally
pulled down to GND.
22
LOS1
I
P r im a r y R efer en ce L oss (T T L ): A high level is applied on this pin when the Primary
reference signal is lost or invalid. Refer to pin description of LOS2. This pin is internally
pulled down to GND.
23
MS2
I
M od e/C on t r ol Select 2 (T T L ): Along with MS1, determines the operating modes
(Manual or Automatic) and operating states when in Maunal mode (Normal, Holdover
or Free-Run).
24
MS1
I
Mod e/C on t r ol Select 1 (T T L ): Refer to pin description of MS2.
25
RSEL
I
R efer en ce Sou r ce Select (T T L ): In Manual mode, low logic level at this pin selects the
Primary Reference as the input reference signal and a high level selects the Secondary.
For Automatic mode, this pin must always be maintained at low logic level. This pin is
internally pulled down to GND.
26
FS2
I
F r eq u en cy Select 2 (T T L ):Together with FS1, selects one of the three DPLL feedback
frequencies to match the desired Input Reference Frequency (8 kHz, 1.544 MHz or 2.048
MHz).
27
FS1
I
F r eq u en cy Select 1 (T T L ): Refer to the pin description of FS2.
I
R eset (Sch m it t ): RST Resets the device when at low logic level. Reset is needed
whenever the operating mode is changed, or the reference signal frequency is switched
or when power-up; so as to ensure proper operation of the device. Following Reset, the
output clocks and frame signals are phase-aligned with the input reference source.
28
PT0100(08/02)
RST
6
Ver:0
Data Sheet
PT7A4402B/4402L
T1/E1 System Synchronizer
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Feedback Frequency Select MUX
Functional Description
The feedback frequency is selected by FS1 and FS2 (as shown
in Table 3) to match the particular incoming reference frequency (1.544MHz, 2.048MHz or 8kHz). A reset (RST) must
be performed after every frequency select input change.
Overall Operation
The PT7A4402B/4402L is a multitrunk synchronizer that provides the clock and frame signals for T1 and E1 primary rate
digital transmission links.
Table 3. Feedback Frequency Selection
It basically consists of the Clock Generator, Mode/State Control Machine, Time Interval Error (TIE) Corrector, Digital PhaseLocked Loop (DPLL), Input Impairment Monitor and Output
Interface Circuit.
F S2
F S1
I n p u t F r eq u en cy
0
0
Reserved
0
1
8kHz
The DPLL circuit provides synchronization of the output signals with any given input reference signal, and the TIE circuit
ensures phase continuity whenever the input reference signal
source is changed.
1
0
1.544MHz
1
1
2.048MHz
Referring to the block diagram on Page 3, the detailed functions of the PT7A4402B/4402L are described as follows.
Time Interval Error (TIE) Corrector
The purpose of the TIE corrector is to allow the phase of the
output signals to be constant while switching between two
mutually incoherent reference signal input sources. Whenever
a new input reference signal is selected, the TIE corrector measures the phase difference between it and the feedback signal
and aligns them using a variable delay circuit. Thus, the TIE
Corrector output a virtual reference input signal for the DPLL
that has the same phase as it had for the previous reference
signal input source. Thus, the PT7A4402B/4402L provides a
totally seamless (“glitch-free”) transition from one reference
signal to another. The TIE Corrector diagram is shown in Figure 3.
Master Clock
The PT7A4402B/4402L uses either an external clock source
or an external crystal and a few discrete components with its
internal oscillator as the master clock.
Reference Select MUX
The PT7A4402B/4402L accepts two independent reference
signals, the primary reference and secondary reference. Either
one of them is selected by the Reference Select MUX circuit
and sent to the TIE circuit. The selection is decided according
to the availability and quality of the reference signals, the
mode operation, and State. Refer to Tables 3, 6 and 7.
Figure 3. TIE Corrector
TCLR
PRI or SEC
From
Select MUX
Comparing
Circuit
Feedback Signal
From
Frequency Select MUX
PT0100(08/02)
Delay Value
Programmable
Delay
Circuit
Virtual Reference
Signal
To DPLL
TIE Corrector Enable
From
Mode/State Machine
7
Ver:0
Data Sheet
PT7A4402B/4402L
T1/E1 System Synchronizer
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Whenever there is a change in the input reference source, such
as a switch from the primary reference signal (PRI) to secondary reference signal (SEC), the typical result is a step change in
phase of the DPLL input signal that causes an unacceptable
step change in the DPLL input signal phase, The TIE Corrector circuit is used to eliminate the step change in the DPLL
input signal phase, thus maintaining continuity of phase at
the DPLL output.
Digital Phase-Locked Loop (DPLL)
The DPLL consists of the Phase Detector, Limiter, Loop Filter,
Digitally Controlled Oscillator (DCO) and Control Circuit.
See Figure 4 for the block diagram of DPLL.
The Virtual Reference Signal from TIE is sent to Phase Detector for comparison with the Feedback Signal from the Feedback Frequency Select MUX. An error signal corresponding to
their instantaneous phase difference is produced and sent to
the Limiter.
Referring to Figure 3, the selected reference signal (e.g. SEC)
feeds the Comparing Circuit where it is compared with the
feedback signal from the output circuit. Whenever there is a
step change in the reference input signal’s phase, the Comparing Circuit will generates a Delay Value for the Programmable
Delay Circuit. The Delay Circuit then delays the input reference signal by the Delay Value, thus providing the DPLL with
a Virtual Reference Signal having no phase discontinuity.
The Limiter amplifies this error signal to ensure the DPLL
responds to all input transient conditions with a maximum
output phase slope of 5ns per 125µs. This performance easily
meets the maximum phase slope of 7.6ns per 125µs or 81ns per
1.326ms specified by AT&T TR62411.
The DPLL phase detects and tracks the Virtual Reference Signal. As the Virtual Reference Signal exhibits no discontinuity
of phase, there is no phase transient in the DPLL output signal.
This is the Normal operation of the device.
The Loop Filter is a 1.9Hz low pass filter for all three reference
frequency selections: 8kHz, 1.544MHz and 2.048MHz. The
filter ensures that the jitter transfer requirements in ETS 300011 and AT&T TR62411 are met.
During the input reference signals source switching process, a
holdover state will occurr before the DPLL begins to track the
Virtual Reference Signal. When the input reference is switched
to the new source, the State Machine initiates Holdover State,
during which the DPLL does not use the Virtual Reference
Signal. Instead, it uses stored information to produce a clock
signal that is compared in the Comparing Circuit with the
Feedback Signal. This compared result is sent to the Programmable Delay Circuit which in turn delivers to the DPLL input
a new Virtual Reference Signal whose phase is aligned with
that of the previous input reference signal. The State Machine
then terminates Holdover State and return the device to Normal state.
The Control Circuit uses signals from the State Machine and
Input Impairment Monitor to control the operating states of
the DPLL. Three states are available, Normal, Holdover and
Free-Run.
The Error Signal, after limited and filtered, is sent to two Digitally Controlled Oscillator (DCO). Based on the processed error value, the DCO will generate the corresponding digital
output signals for the Tapped Delay Line in the Output Interface Circuit to produce 12.352MHz and 16.384MHz signals.
The DCO synchronization method depends upon the
PT7A4402B/4402L operating state, as follows:
In Normal state, the DCO generates an output signal which is
frequency and phase locked to the selected input reference
signal.
As the Programmable Delay Circuit maintains the phase of the
Virtual Reference Signal while the TIE Corrector is enabled,
there will in general be a time delay between the chip output
signals and the selected input reference signal after switching
to a new input reference source (e.g. from PRI to SEC). Each
time a new reference source is selected, there will in general be
a new time delay. The value of this delay represents the accumulation of the phase errors measured and corrected for during
the various reference source switching events.
In Holdover state, the DCO generates an output signal whose
frequency is equal to what it was for a 30ms period shortly
before the end of the last Normal State.
In Free-Run state, the DCO is free running with an accuracy
equal to that of the OSCi 20MHz source.
The Programmable Delay Circuit can be zeroed through the
TCLR pin (low level, min. duration 300ns), realigning the
output signals with the present input reference signal. The
speed of realignments is limited by the Limiter in the DPLL to
5ns per 125µs. Convergence is in the direction of least phase
travel.
PT0100(08/02)
8
Ver:0
Data Sheet
PT7A4402B/4402L
T1/E1 System Synchronizer
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Output Interface Circuit
The E1 Divider uses the 16.384MHz signal to generate four
clock signals and three frame signals, i.e., C2, C4, C8, C16,
F0, F8 and F16. The frame signals are generated directly from
the C16 signal.
The Output Interface Circuit consists of the Tapped Delay Lines
and E1/T1 Dividers as shown in Figure 5.
Signals from the DCO are sent to Tapped Delay Lines to generate two clock signals, 16.384MHz and 12.352MHz, which are
divided in the T1 and E1 Dividers respectively to provide
needed clock and frame signals.
The C2, C4, C16 and C8 signals have nominal 50% duty cycle.
All the frame and clock outputs are locked to each other for all
operating states. They have limited driving capability and
should be buffered when driving high capacitance loads.
The T1 Divider uses the 12.352MHz signal to generate two
clock signals, C1.5 and C3. They have a nominal 50% duty
cycle.
Figure 4. Block Diagram of DPLL
Virtual
Reference
from TIE
Corrector
Phase
Detector
Loop
Filter
Limiter
DCO
DPLL Reference
to
Output Interface
Circuit
Control Circuit
Feedback Signal
From
Frequency Select MUX
State Select From
Input Impairment
Monitor
State Select
From
State Machine
Figure 5. Block Diagram of Output Interface Circuit
Signal
From
DCO1
Signal
From
DCO2
PT0100(08/02)
Tapped
Delay
Line
Tapped
Delay
Line
12MHz
16MHz
9
T1
Divider
E1
Divider
C1.5
C3
C2
C4
C8
C16
F0
F8
F16
Ver:0
Data Sheet
PT7A4402B/4402L
T1/E1 System Synchronizer
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Mode/State Control Machine
Modes and States of Operation
The Mode/State Control Machine determines whether the
PT7A4402B/4402L operates in Automatic or Manual mode,
and whether it is in the Normal, Holdover or Free-Run state. In
Automatic Mode, the PT7A4402B/4402L selects one of three
states, Normal, Holdover or Free-Run State. The sequence is
determined by LOS1, LOS2 and GTi signals. In Manual Mode,
a single state of operation is selected, in accordance with the
MS1, MS2, GTi and RSEL signals.
The PT7A4402B/4402L operates either in Manual mode or
Automatic mode. Each mode has three possible operating
states, Normal, Holdover or Free-Run.
Shown in Table 4 and Table 5 are the mode and state selection
instructions, using pins MS1, MS2, and RSEL.
Table 4. Input Reference Selection
All mode and state changes are synchronous with the rising
edge of F8. See the Modes and States of Operation section for
complete details.
Mod es
Guard Time Circuit
Manual
The Guard Time Circuit sends control signal (GTi) to Mode/
State Control Machine for control of Modes and States. It has
two functions:
- enabling/disabling the TIE Corrector (Manual and Automatic) (Refer to Table 6 and 7);
- selecting which mode change takes place (Automatic
only).
R SE L
I n p u t R efer en ce
0
PRI
1
SEC
0
Mode/State Machine Control
1
Reserved
Auto
Table 5. Operation Modes and States
Under Automatic Mode and in Primary Normal State, two state
changes are possible (not counting Auto-Holdover). They are:
- Primary Normal to Primary Holdover, and
- Primary Normal to Secondary Normal.
The level at the GTi pin determines which state occurs. When
- GTi=0, Primary Normal to Primary Holdover,
- GTi=1, Primary Normal to Secondary Normal.
Input Impairment Monitor
This circuit monitors the input signals to the DPLL and automatically enables the Holdover State (Auto-Holdover) when
the incoming signal is completely lost, or if its frequency is
outside the auto-holdover capture range (either a small or large
amount). When the incoming signal returns to normal, the
DPLL will be returned to Normal State.
MS2
MS1
Mod es
St a t es
0
0
Manual
Normal
0
1
Manual
Holdover
1
0
Manual
Freerun
1
1
Auto
Mode/State
Machine Control
The Auto-Holdover circuit does not use TIE correction. Therefore, the phase delay between the input and output after switching back to Normal State is preserved (is the same as just prior
to the switch to Auto-Holdover).
PT0100(08/02)
10
Ver:0
Data Sheet
PT7A4402B/4402L
T1/E1 System Synchronizer
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Manual Mode
Holdover State
The Manual Operation Mode is used when either very simple
control is required, or when complex control is required which
is not accommodated by Automatic Mode. For example,
Manual Mode can be used in a system requiring only Normal
State and only one input stimulus (RSEL). Complex control is
used for systems requiring states of operation and more input
stimuli. In such cases, external circuitry, typically a
microcontroller, is needed.
In Holdover State, the output signals of PT7A4402B/4402L
are not synchronized with the external input reference signal.
Instead, they are generated by using the information stored
30ms to 60ms before when the device operated in Normal
State.
In Manual Mode, one of the three states is selected by MS2
and MS1. The active reference input is selected by the RSEL
pin. See Table 4 and Table 5. For the state change situation,
refer to Table 6 and Figure 6.
Automatic Mode
Automatic Mode is used in systems requiring neither very
simple nor very complex control, which can be realized by the
PT7A4402B/4402L in accordance with the State Change Diagram shown in Figure 7.
When in Normal Mode, a numerical value corresponding to
the output reference frequency is stored alternately in two
memory locations every 30ms. When the device is switched
into Holdover state, the value in memory from (between 30ms
and 60ms) is used to set the output frequency of the device.
Generally, the amount of phase drift while in Holdover is negligible because the Holdover State is very accurate. Two factors affect the accuracy of Holdover State. One is drift on the
Master Clock while in Holdover State. The change in OSCi
accuracy while in Holdover, other than absolute Master Clock
(OSCi) accuracy, will affect the holdover accuracy. The other
factor is large jitter on the reference input prior (30 to 60ms) to
the mode switch.
Automatic Mode is also selected by MS2 and MS1 (set 1,1). In
this Mode, the PT7A4402B/4402L will operate in three states
alternatively. The changes of states will follow a sequence
automatically under control of LOS1, LOS2 and GTi. See Table
7 and Figure 7 for the state change sequence.
The Holdover State is generally used for short durations, under control of GTi signal, when the synchronization to the
input reference is temporarily disturbed.
Normal State
Typically he Free-Run State is used when a master clock is
required or immediately following system power-up before
network synchronization is achieved.
In Normal State, the PT7A4402B/4402L output signals are
synchronized with one of two input reference inputs.
In this state, the input reference signal is used, with or without
TIE correction, as reference for the DPLL phase detector.
PT0100(08/02)
Free-Run State
In Free-Run State, the outputs of the PT7A4402B/4402L are
uncorrelated with the input reference signal and the stored
information of output reference. Instead, these output signals
are based solely on the master clock frequency (OSCi). The
accuracy of the output clock is equal to the accuracy of the
master clock (OSCi).
11
Ver:0
Data Sheet
PT7A4402B/4402L
T1/E1 System Synchronizer
||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Table 6. Manual Operation Mode
I n p u t C on t r ol
St a t e
F r ee-R u n
MS2
MS1
R SE L
S0
Nor ma l
(P R I )
S1
Nor ma l
(SE C )
S2
H old over
(P R I )
S1H
H old over
(SE C )
S2H
G Ti
0
0
0
0
S1
-
S1 TIE
S1
S1 TIE
0
0
0
1
S1
-
S1 TIE
S1 TIE
S1 TIE
0
0
1
X
S2
S2 TIE
-
S2 TIE
S2 TIE
0
1
0
X
/
S1H
/
-
/
0
1
1
X
/
/
S2H
/
-
1
0
X
X
-
S0
S0
S0
S0
L egen d : -: No change
/: Not valid
TIE: State change occurs with TIE Corrector circuit.
Refer to figure 6 for state changes to and from Auto-Holdover state.
Figure 6. Diagram of State Change in Manual Mode
S0
Free-Run
(10X)
S1
Normal
Primary
(000)
GTi=1
GTi=0
IR
S2A
Auto-Holdover
Secondary
(001)
S1A
Auto-Holdover
Primary
(000)
IR
S2
Normal
Secondary
(001)
S2H
Holdover
Secondary
(011)
S1H
Holdover
Primary
(010)
Notes:
(xxx): (MS2 MS1 RSEL)
* Movement to Normal State from any state requires a
IR: Invalid Reference Signal
valid input signal.
: Phase re-alignment
: Phase continuity maintained without TIE Corrector
: Phase continuity maintained with TIE Corrector
PT0100(08/02)
12
Ver:0
Data Sheet
PT7A4402B/4402L
T1/E1 System Synchronizer
||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Table 7. Automatic Operation Mode (MS1 MS2=11, RSEL=0)
I n p u t C on t r ol
St a t e
F r ee-R u n
L O S2
L O S1
G Ti
S0
Nor ma l
(P R I )
S1
Nor ma l
(SE C )
S2
H old over
(P R I )
S1H
H old over
(SE C )
S2H
R ST
1
1
X
0 to 1
-
S0
S0
S0
S0
X
0
0
1
S1
-
S1 TIE
S1
S1 TIE
X
0
1
1
S1
-
S1 TIE
S1 TIE
S1 TIE
0
1
0
1
S2
S1H
-
-
S2 TIE
0
1
1
1
S2
S2 TIE
-
S2 TIE
S2 TIE
1
1
X
1
-
S1H
S2H
-
-
L egen d : -: No change
/: Not valid
TIE: State change occurs with TIE Corrector circuit.
Refer to figure 7 for state changes to and from Auto-Holdover state.
Figure 7. Diagram of State Change in Automatic Mode
(11X)
(11X) RST=1
Reset
S0
Free-Run
(X0X)
(01X)
(X0X)
(011)
(01X)
(X0X)
(01X)
(X0X)
S1
Normal
Primary
IR
S2A
Auto-Holdover
Secondary
S1A
Auto-Holdover
Primary
IR
S2
Normal
Secondary
(X0X)
(011)
(X0X)
(010 or 11X)
(X01)
(X00)
(011)
(010 or 11X)
(01X)
S2H
Holdover
Secondary
S1H
Holdover
Primary
(010 or 11X)
(11X)
Notes:
(xxx): (LOS2 LOS1 GTi)
IR: Invalid Reference Signal
: Phase re-alignment
: Phase continuity maintained without TIE Corrector
: Phase continuity maintained with TIE Corrector
PT0100(08/02)
(11X)
(11X)
13
* Movement to Normal State from any state requires a
valid input signal.
Ver:0
Data Sheet
PT7A4402B/4402L
T1/E1 System Synchronizer
||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Applications Information
• Crystal Oscillator
Master Clock
If a crystal oscillator is selected as the master timing source, it
should be connected to the PT7A4402B/4402L as shown in
Figure 9.
The PT7A4402B/4402L uses either an external clock source
or an external crystal as the master timing source.
Figure 9. Crystal Oscillator Connection
In Free-Run State, the frequency tolerance of the PT7A4402B/
4402L output clocks are equal to the frequency tolerance of
the timing source. In an application, if an accurate Free-Run
State is not required, the tolerance of the master timing source
may be 100ppm. If required, the tolerance must be no greater
than 32ppm.
PT7A4402B/4402L
20MHz
OSCi
The capture range of PT7A4402B/4402L will also be considered when deciding the accuracy of the master timing source.
The sum of the accuracy of the master timing source and the
capture range of the PT7A4402B/4402L will always equal
230ppm. For example, if the master timing source is 100ppm,
the capture range will be 130ppm.
1MΩ
OSCo
56pF
39pF
3-50pF
100Ω
• Clock Oscillator
If using an external clock source, its output pin should be
connected directly (not AC coupled) to the OSCi pin of the
PT7A4402B/4402L and the OSCo pin of PT7A4402B/4402L
can be left open as shown in Figure 8 or connected as an output pin.
The crystal specification is as follows:
- Frequency:
- Tolerance:
- Oscillation Mode:
- Resonance Mode:
- Load Capacitance:
- Maximum Series Resistance:
- Αpproximate Drive Level:
Figure 8. Clock Oscillator Connection
PT7A4402B/4402L
+5V
OSCi
Guard Time Adjustment Circuit
+5V
20MHz OUT
GND
0.1µF
OSCo
No Connection
When selecting the clock oscillator, following specifications
should be considered. They are
- absolute frequency
- frequency change over temperature
- output rise and fall time
- output level
- duty cycle
Refer to AC Electrical Characteristics.
PT0100(08/02)
20MHz
as required
Fundamental
Parallel
32pF
35Ω
1mW
AT&T TR62411 recommends that excessive switching of the
timing reference should be minimized. Switching between references should be performed only when the primary signal is
degraded.
The Holdover State is used to minimize reference source
switching (from PRI to SEC). When the PRI signal is degraded,
the PT7A4402B/4402L enters Holdover State for a predetermined maximum time (i.e., guard time). If the PRI signal returns to normal before the expiration of the guard time (level
at GTi pin is low), the PT7A4402B/4402L will return to Normal State with PRI input reference. If the PRI signal is still
degraded after expiration of the guard time (level at GTi becomes high), the reference switching (from PRI to SEC) will
occur.
14
Ver:0
Data Sheet
PT7A4402B/4402L
T1/E1 System Synchronizer
||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
A simple way to control the Guard Time is shown in Figure 10.
The Guard Time can be calculated as follows:
VCC
) ≅ RC x 0.6
tGd = RC x ln (
In cases where fast toggling of the LOS1 input might be expected, an unsymmetrical Guard Time Circuit is recommended
as shown in Figure 11. This setting ensures that reference
switching does not occur until the entire guard time has expired. The timing diagram is shown in Figure 12.
VCC - VSIH
* VSIH is the logic high going threshold for the GTi Schmitt Trigger
input, see DC Electrical Characteristics.
Figure 11. Unsymmetrical Guard Time Circuit
Figure 10. Symmetrical Guard Time Circuit
PT7A4402B/4402L
PT7A4402B/4402L
GTo
GTo
GTi
R
150kΩ
RC
150kΩ
+
+ C
10µF
C
10µF
RD
1kΩ
RP
1kΩ
RP
1kΩ
GTi
Figure 12. Timing Example of Unsymmetrical Guard Time Circuit in Automatic Mode
SEC
Signal
Status
Good
LOS2
PRI
Signal
Status
Good
Bad
Good
Bad
Good
TD
TD
LOS1
GTo
VSIH
GTi
PT7A4402B
/4402L State
PT0100(08/02)
PRI
Normal
PRI
Holdover
PRI
Normal
PRI
Holdover
15
SEC
Normal
PRI
Normal
Ver:0
Data Sheet
PT7A4402B/4402L
T1/E1 System Synchronizer
||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Reset Circuit
Detailed Specifications
A simple power up reset circuit with about a 50µs reset active
(low) time is shown in Figure 13. Resistor RP is for protection
only. The reset low time is not critical but should be greater
than 300ns.
Definitions of Critical Performance
Specifications
Intrinsic Jitter: Intrinsic jitter is the jitter produced by the
synchronizing circuit. It is measured by applying a reference
signal with no jitter to the input of the device, and measuring
its output jitter. Intrinsic jitter may also be measured when the
device is in a non-synchronizing mode - such as free running
or holdover - by measuring the output jitter of the device.
Intrinsic jitter is usually measured with various band limiting
filters depending on the applicable standards.
Figure 13. Power-up Reset Circuit
PT7A4402B/4402L
+5V
R
10kΩ
RST
RP
1kΩ
C
10nF
Jitter Transfer: Jitter transfer or jitter attenuation refers to the
magnitude of jitter at the output of a device with respect to a
given amount of jitter at the input of the device. Input jitter is
applied at various amplitudes and frequencies, and output jitter is measured with various filters depending on the applicable standards.
Power Supply Decoupling
The PT7A4402B/4402L has two VCC pins and two GND pins.
Power decoupling capacitors should be included as shown in
Figure 14.
Figure 14. Power Supply Decoupling
C1
0.1µF
+
18
PT7A4402B
/4402L
15
5
1
Jitter Tolerance: Jitter tolerance is a measure of the ability of
a PLL to operate properly (i.e., remain in lock and/or regain
lock in the presence of large jitter magnitudes at various jitter
frequencies) when jitter is present on its reference. The applicable standard specifies how much jitter to apply to the reference when testing for jitter tolerance.
+
C2
0.1µF
Its 3 possible input frequencies and 9 outputs give the
PT7A4402B/4402L 27 possible jitter transfer combinations.
However, only three cases of the jitter transfer specifications
are given in the AC Electrical Characteristics; as the remaining
combinations can be derived from them.
For the PT7A4402B/4402L, two internal elements determine
the jitter attenuation. They are internal 1.9Hz low pass loop
filter and phase slope limiter. The phase slope limiter limits
the output phase slope to 5ns/125µs. Therefore, if the input
signal exceeds this rate, such as for very large amplitude low
frequency input jitter, the maximum output phase slope will
be limited (i.e., attenuated) to 5ns/125µs.
It should be noted that 1UI at 1.544MHz (644ns) is not equal
to 1UI at 2.048MHz (488ns). A transfer value using different
input and output frequencies must be calculated in common
units (e.g., seconds) as shown in the following example.
Example : When the T1 input jitter is 20UI (T1 UI Units) and
the T1 to T1 jitter attenuation is 18dB, The T1 and E1 output
jitter can be calculated as follows:
PT0100(08/02)
16
Ver:0
Data Sheet
PT7A4402B/4402L
T1/E1 System Synchronizer
||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
JT1o = JT1i x 10
( -A
20 )
= 20 x 10
( -18
)
20
= 2.5UI
JE1o = JT1o x ( 1UIT1) = JT1o x ( 644ns ) = 3.3UI
488ns
1UIE1
Using the above method, the jitter attenuation can be calculated for all combinations of inputs and outputs based on the
three jitter transfer functions provided.
Note that the resulting jitter transfer functions for all combinations of inputs (8kHz, 1.544MHz, 2.048MHz) and outputs
(8kHz, 1.544MHz, 2.048MHz, 4.096MHz, 8.192MHz,
16.384MHz) for a given input signal (jitter frequency and jitter amplitude) are the same.
Since intrinsic jitter is always present, jitter attenuation will
appear to be lower for small input jitter signals than for large
ones. Consequently, accurate jitter transfer function measurements are usually made with large input jitter signals (e.g.,
75% of the specified maximum jitter tolerance).
Frequency Accuracy: Frequency accuracy is defined as the
absolute tolerance of an output clock signal when it is not
locked to an external reference, but is operating in a free running mode. For the PT7A4402B/4402L, the Free-Run accuracy is equal to the Master Clock (OSCi) accuracy.
Holdover Accuracy: Holdover accuracy is defined as the absolute tolerance of an output clock signal, when it is not locked
to an external reference signal, but is operating using storage
techniques. For the PT7A4402B/4402L the storage value is
determined while the device is in Normal State and locked to
an external reference signal. The absolute Master Clock (OSCi)
accuracy of the PT7A4402B/4402L does not affect Holdover
accuracy, but the change in OSCi accuracy while in Holdover
Mode does.
Lock Range: If the PT7A4402B/4402L DPLL is already in a
state of synchronization (“lock”) with the incoming reference
signal, it is able to track this signal to maintain lock as its
frequency varies over a certain range, called the Lock Range.
The size of Lock Range is related to the range of the Digitally
Controlled Oscillators and is equal to 230ppm minus the accuracy of the master clock (OSCi). For example, a 32ppm master clock results in a Lock Range of 198ppm.
PT0100(08/02)
Capture Range: The PT7A4402B/4402L DPLL is not at present
in a state of synchronization (lock) with the incoming reference
signal, it is able to initiate (acquire) lock only if the signal’s frequency is within a certain range, called the Capture Range. For
any PLL, no portion of the Capture Range can fall outside the
Lock Range, and, in general, the Capture Range is more narrow
than the Lock Range. However, owing to the design of its Phase
Detector, the PT7A4402B/4402L’s Capture Range is equal to its
Lock Range.
Phase Slope: Phase slope is measured in seconds per second
and is the rate at which a given signal changes phase with
respect to an ideal signal of constant frequency. The given
signal is typically the output signal. The ideal signal is of
constant frequency and is nominally equal to the value of the
final output signal or final input signal.
Time Interval Error (TIE): TIE is the time delay between a
given timing signal and an ideal timing signal.
Maximum Time Interval Error (MTIE): MTIE is the maximum peak to peak delay between a given timing signal and an
ideal timing signal within a particular observation period.
MTIE(S) = TIEmax(t) - TIEmin(t)
Phase Continuity: Phase continuity is the phase difference
between a given timing signal and an ideal timing signal at
the end of a particular observation period. Usually, the given
timing signal and the ideal timing signal are of the same frequency. Phase continuity applies to the output of the synchronizer after a signal disturbance due to a reference source switch
or a state change. The observation period is usually the time
from the disturbance, to just after the synchronizer has settled
to a steady state.
For the PT7A4402B/4402L, the output signal phase continuity is maintained to within 5ns at the instance (over one frame)
of all reference source switches and all state changes. The total
phase shift, depending on the switch or type of state change,
may accumulate up to 200ns over many frames. The rate of
change of the 200ns phase shift is limited to a maximum phase
slope of approximately 5ns/125µs. This meets the AT&T
TR62411 maximum phase slope requirement of 7.6ns/125µs
(81ns/1.326ms).
17
Ver:0
Data Sheet
PT7A4402B/4402L
T1/E1 System Synchronizer
||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Absolute Maximum Ratings
Storage Temperature ...................................................... -65oC to +150oC
Ambient Temperature with Power Applied ...................... -40oC to +85oC
Supply Voltage to Ground Potential (Inputs & VCC Only) ...... -0.3 to 7.0V
Supply Voltage to Ground Potential (Outputs & D/O Only) .. -0.3 to 7.0V
DC Input Voltage .................................................................. -0.3 to 7.0V
DC Output Current ...................................................................... 120mA
Power Dissipation ....................................................................... 900mW
Note:
Stresses greater than those listed under MAXIMUM
RATINGS may cause permanent damage to the
device. This is a stress rating only and functional
operation of the device at these or any other conditions above those indicated in the operational sections of this specification is not implied. Exposure
to absolute maximum rating conditions for extended periods may affect reliability.
Recommended Operating Conditions
Table 8. Recommended Operating Conditions
Sym
Descr ip t ion
Test C on d it ion s
Supply Voltage for 4402B
VCC
Supply Voltage for 4402L
TA
PT0100(08/02)
Over Recommended
Operating Conditions
Operating Temperature
18
Min
Typ
Ma x
Un it s
4.5
5.0
5.5
V
3.0
3.3
3.6
V
-40
25
85
o
C
Ver:0
Data Sheet
PT7A4402B/4402L
T1/E1 System Synchronizer
||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
DC Electrical and Power Supply Characteristics
Table 9. DC Electrical and Power Supply Characteristics
Sym
Descr ip t ion
ICCQ
Quiescent Power Supply Current
Device
Test C on d it ion s
Min
4402B
Typ
Ma x
Un it s
500
µA
200
µA
50
mA
25
mA
60
mA
35
mA
OSCi = 0V, Note 2
4402L
4402B
OSCi = Clock, Note 2
4402L
ICC
Supply Current
4402B
OSCi = Crystal, Note 2
4402L
VIH
TTL HIGH Input Voltage-All pins
except OSCi, RST and GTi
VIL
TTL LOW Input Voltage-All pins
except OSCi, RST and GTi
VCIH
CMOS HIGH Input VoltageOSCi pin
VCIL
CMOS LOW Input VoltageOSCi pin
VSIH
Schmitt HIGH Input VoltageGTi, RST pins
VSIL
Schmitt LOW Input VoltageGTi, RST pins
VHYS
Schmitt Hysteresis VoltageGTi, RST pins
Input Leakage Current - Pins: SEC,
PRI
IIL
Input Leakage Current - Pins:
TCLR, LOS2, LOS1, MS1, RESL
2.0
0.8
0.3VCC
VOL
LOW Output Voltage
V
4402B
3.6
V
4402L
2.6
V
4402B
1.8
V
4402L
1.1
V
0.4
V
4402B
-140
µA
4402L
-100
µA
4402B
VI = VCC or 0V
4402L
-10
4402B
HIGH Output Voltage
V
V
0.7VCC
Input Leakage Current - other pins
VOH
V
IOH = -4mA
4402L
140
µA
100
µA
10
µA
2.4
V
2.0
V
IOL = 4mA
0.8
V
Note:
1. Supply voltages and operating temperature are as per Recommended Operating Conditions.
2. MS2 = VCC, FS1 = VCC , FS2= GND, other inputs connected to GND.
3. All outputs are unloaded except for VOH and VOL measurement.
PT0100(08/02)
19
Ver:0
Data Sheet
PT7A4402B/4402L
T1/E1 System Synchronizer
||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
AC Electrical Characteristics
Performance
Table 10. Performance
Sym
Descr ip t ion
Test C on d it ion s*
Ma x
Un it s
0
0
ppm
-32
+32
ppm
100ppm
-100
+100
ppm
0ppm
-0.05
+0.05
ppm
-0.05
+0.05
ppm
100ppm
-0.05
+0.05
ppm
0ppm
-190
+230
ppm
-158
+198
ppm
-90
+130
ppm
1-3, 6-14
30
s
Reference Switch
1-3, 6-14
200
ns
State Switch to Normal
1-2, 4-14
200
ns
State Switch to Free-Run
1-4, 6-14
200
ns
State Switch to Holdover
1-3, 6-14
50
ns
600
ns
45
µs/s
0ppm
Free-Run State Accuracy with OSCi at:
32ppm
Holdover State Accuracy with OSCi at:
Capture Range With OSCi at:
32ppm
32ppm
5-8
1, 2, 4, 6-8, 40
1-3, 6-8
100ppm
Phase Lock Time
Output Phase Continuity with:
Min
Typ
MTIE (Maximum Time Interval Error)
1-14, 27
Output Phase Slope
8kHz
1-3, 6, 9-11
<-30k
or
>+30k
ppm
Reference Input for Auto-Holdover with:1.544MHz
1-3, 7, 9-11
<-30k
or
>+30k
ppm
1-3, 8-11
<-30k
or
>+30k
ppm
2.048MHz
* Refer to the Test Conditions on Page 32 for details.
PT0100(08/02)
20
Ver:0
Data Sheet
PT7A4402B/4402L
T1/E1 System Synchronizer
||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Voltage Levels for Timing Parameter Measurement
Table 11. Voltage Levels for Timing Parameter Measurement
Sym
Descr ip t ion
Sch mit t
TTL
CMOS
Un it s
VT
Threshold Voltage
0.5VCC
1.5
0.5VCC
V
VHM
Rising and Falling Threshold Voltage High
0.7VCC
2.0
0.7VCC
V
VLM
Rising and Falling Threshold Voltage Low
0.3VCC
0.8
0.3VCC
V
Figure 15. Voltage Levels for Timing Parameter Measurement
Timing Reference Points
Signal
VHM
VT
VLM
tIF.tOF
PT0100(08/02)
tIR.tOR
21
Ver:0
Data Sheet
PT7A4402B/4402L
T1/E1 System Synchronizer
||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Input and Output Timing
Table 12. Input and Output Timing of 4402B
Sym
tRW
Descr ip t ion
Test C on d it ion s*
Reference Input pulse Width High or Low
Min
Typ
Ma x
100
Un it s
ns
1-3, 6-11, 39
tIRF
Reference Input Rising or Falling Time
10
ns
tR8D
8kHz Reference Input to F8 Delay
-28
-1
ns
tR15D
1.544kHz Reference Input to F8 Delay
337
363
ns
tR2D
2.048kHz Reference Input to F8 Delay
225
240
ns
tF0D
F8 to F0 Delay
1-14, 21, 39
110
134
ns
tF16D
F8 to F16 Delay
1-14, 21
19
44
ns
tC15D
F8 to C1.5 Delay
-45
-31
ns
tC3D
F8 to C3 Delay
-46
-31
ns
tC2D
F8 to C2 Delay
-10
5
ns
tC4D
F8 to C4 Delay
-10
5
ns
tC8D
F8 to C8 Delay
-10
5
ns
tC16D
F8 to C16 Delay
-10
5
ns
tC15W
C1.5 Pulse Width High or Low
309
339
ns
tC3W
C3 Pulse Width High or Low
149
175
ns
tC2W
C2 Pulse Width High or Low
230
258
ns
tC4W
C4 Pulse Width High or Low
111
133
ns
tC8W
C8 Pulse Width High or Low
52
70
ns
1-3, 6-14, 21, 23, 38
1-14, 21, 39
* Refer to the Test Conditions on Page 32 for details.
PT0100(08/02)
22
Ver:0
Data Sheet
PT7A4402B/4402L
T1/E1 System Synchronizer
||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Table 13. Input and Output Timing of 4402L
Sym
tRW
Descr ip t ion
Test C on d it ion s*
Reference Input pulse Width High or Low
Min
Typ
Ma x
100
Un it s
ns
1-3, 6-11, 39
tIRF
Reference Input Rising or Falling Time
10
ns
tR8D
8kHz Reference Input to F8 Delay
-21
6
ns
tR15D
1.544kHz Reference Input to F8 Delay
345
371
ns
tR2D
2.048kHz Reference Input to F8 Delay
230
246
ns
tF0D
F8 to F0 Delay
1-14, 21, 39
112
138
ns
tF16D
F8 to F16 Delay
1-14, 21
19
44
ns
tC15D
F8 to C1.5 Delay
-47
-31
ns
tC3D
F8 to C3 Delay
-49
-32
ns
tC2D
F8 to C2 Delay
-11
4
ns
tC4D
F8 to C4 Delay
-11
4
ns
tC8D
F8 to C8 Delay
-11
4
ns
tC16D
F8 to C16 Delay
-11
4
ns
tC15W
C1.5 Pulse Width High or Low
309
339
ns
tC3W
C3 Pulse Width High or Low
149
175
ns
tC2W
C2 Pulse Width High or Low
230
258
ns
tC4W
C4 Pulse Width High or Low
111
133
ns
tC8W
C8 Pulse Width High or Low
52
70
ns
1-3, 6-14, 21, 23, 38
1-14, 21, 39
* Refer to the Test Conditions on Page 32 for details.
PT0100(08/02)
23
Ver:0
Data Sheet
PT7A4402B/4402L
T1/E1 System Synchronizer
||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Table 14. Input and Output Timing (Continued)
Sym
Descr ip t ion
Test C on d it ion s*
Min
1-14, 21
Typ
Ma x
Un it s
26
37
ns
tC16WL
C16 Pulse Width Low
tF0WL
F0 Pulse Width Low
230
258
ns
tF8WH
F8 Pulse Width High
111
133
ns
tF16WL
F16 Pulse Width Low
52
70
ns
9
ns
tORF
Output Clock and Frame Pulse Rising
or Falling Time
1-14, 21, 39
tS
Input Controls Setup Time
100
ns
tH
Input Controls Hold Time
100
ns
* Refer to the Test Conditions on Page 32 for details.
PT0100(08/02)
24
Ver:0
Data Sheet
PT7A4402B/4402L
T1/E1 System Synchronizer
||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Figure 16. Input to Output Timing (Normal State after TCLR or RST)
t R 8D
PR I/SE C
8kH z
VT
tRW
t R 15 D
tRW
PR I/SE C
1.544M Hz
VT
t R 2D
tRW
PR I/SE C
2.048M Hz
VT
VT
F8
Note: Input to output delay values are valid after a TCLR or RST with no further state changes.
Figure 17. Output Timing
t F 8W H
VT
F8
tF0D
t F 0W L
F0
VT
t F 16 D
t F 16 W L
F16
t C 16 W L
VT
t C 16 D
C16
VT
tC8W
tC8W
tC8D
C8
VT
tC4D
tC4W
C4
VT
tC4W
tC2D
tC2W
C2
VT
tC3D
tC3W
tC3W
C3
VT
t C 15 D
t C 15 W
C 1 .5
PT0100(08/02)
VT
25
Ver:0
Data Sheet
PT7A4402B/4402L
T1/E1 System Synchronizer
||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Figure 18. Setup and Hold Timing of Input Controls
VT
F8
tS
tH
MS1,2
LOS1,2
RSEL
GTi
VT
Intrinsic Jitter Unfiltered
Table 15. Intrinsic Jitter Unfiltered
Sym
Descr ip t ion
Test C on d it ion s*
Instrinsic Jitter at F8 (8kHz)
Instrinsic Jitter at F0 (8kHz)
1-14, 21-24, 28
Instrinsic Jitter at F16 (8kHz)
Min
Typ
Ma x
Un it s
0.0002
UIpp
0.0002
UIpp
0.0002
UIpp
Instrinsic Jitter at C1.5 (1.544MHz)
1-14, 21-24, 29
0.030
UIpp
Instrinsic Jitter at C2 (2.048MHz)
1-14, 21-24, 30
0.040
UIpp
Instrinsic Jitter at C3 (3.088MHz)
1-14, 21-24, 31
0.060
UIpp
Instrinsic Jitter at C4 (4.096MHz)
1-14, 21-24, 32
0.080
UIpp
Instrinsic Jitter at C8 (8.192MHz)
1-14, 21-24, 33
0.160
UIpp
Instrinsic Jitter at C16 (16.384MHz)
1-14, 21-24, 34
0.320
UIpp
* Refer to the Test Conditions on Page 32 for details.
PT0100(08/02)
26
Ver:0
Data Sheet
PT7A4402B/4402L
T1/E1 System Synchronizer
||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
C1.5 (1.544MHz) Instrinsic Jitter Filtered
Table 16. C1.5 (1.544MHz) Instrinsic Jitter Filtered
Sym
Descr ip t ion
Test C on d it ion s*
Min
Typ
Ma x
Un it s
0.015
UIpp
0.010
UIpp
Instrinsic Jitter (8kHz to 40kHz Filter)
0.010
UIpp
Instrinsic Jitter (10Hz to 8kHz Filter)
0.005
UIpp
Ma x
Un it s
0.015
UIpp
0.010
UIpp
Instrinsic Jitter (8kHz to 40kHz Filter)
0.010
UIpp
Instrinsic Jitter (10Hz to 8kHz Filter)
0.005
UIpp
Instrinsic Jitter (4Hz to 100kHz Filter)
Instrinsic Jitter (10Hz to 40kHz Filter)
1-14, 21-24, 29
* Refer to the Test Conditions on Page 32 for details.
C2 (2.048MHz) Instrinsic Jitter Filtered
Table 17. C2 (2.048MHz) Instrinsic Jitter Filtered
Sym
Descr ip t ion
Test C on d it ion s*
Instrinsic Jitter (4Hz to 100kHz Filter)
Instrinsic Jitter (10Hz to 40kHz Filter)
Min
Typ
1-14, 21-24, 30
* Refer to the Test Conditions on Page 32 for details.
PT0100(08/02)
27
Ver:0
Data Sheet
PT7A4402B/4402L
T1/E1 System Synchronizer
||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
8kHz Input to 8kHz Output Jitter Transfer
Table 18. 8kHz Input to 8kHz Output Jitter Transfer
Sym
Descr ip t ion
Test C on d it ion s*
Min
Typ
Ma x
Un it s
Jitter Attenuation for 1Hz with
0.01UIpp Input
0
6
dB
Jitter Attenuation for 1Hz with
0.54UIpp Input
6
16
dB
12
22
dB
28
38
dB
Jitter Attenuation for 10Hz with
0.10UIpp Input
Jitter Attenuation for 60Hz with
0.10UIpp Input
1-3, 6, 9-14, 21, 22, 24,
28, 35
Jitter Attenuation for 300Hz with
0.10UIpp Input
42
dB
Jitter Attenuation for 3600Hz with
0.005UIpp Input
45
dB
* Refer to the Test Conditions on Page 32 for details.
1.544MHz Input to 1.544MHz Output Jitter Transfer
Table 19. 1.544MHz Input to 1.544MHz Output Jitter Transfer
Sym
Descr ip t ion
Test C on d it ion s*
Min
Typ
Ma x
Un it s
Jitter Attenuation for 1Hz with 20UIpp
Input
0
6
dB
Jitter Attenuation for 1Hz with 104UIpp
Input
6
16
dB
Jitter Attenuation for 10Hz with 20UIpp
Input
12
22
dB
28
38
dB
Jitter Attenuation for 60Hz with 20UIpp
Input
1-3, 7, 9-14, 21, 22, 24,
29, 35
Jitter Attenuation for 300Hz with
20UIpp Input
42
dB
Jitter Attenuation for 10kHz with
0.3UIpp Input
45
dB
Jitter Attenuation for 100kHz with
0.3UIpp Input
45
dB
* Refer to the Test Conditions on Page 32 for details.
PT0100(08/02)
28
Ver:0
Data Sheet
PT7A4402B/4402L
T1/E1 System Synchronizer
||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
2.048MHz Input to 2.048MHz Output Jitter Transfer
Table 20. 2.048MHz Input to 2.048MHz Output Jitter Transfer
Sym
Descr ip t ion
Test C on d it ion s*
Min
Typ
Ma x
Un it s
1-3,8,9-14,21,22,24,30,35
2.9
UIpp
1-3,8,9-14,21,22,24,30,36
0.09
UIpp
1-3,8,9-14,21,22,24,30,35
1.3
UIpp
1-3,8,9-14,21,22,24,30,36
0.10
UIpp
1-3,8,9-14,21,22,24,30,35
0.80
UIpp
1-3,8,9-14,21,22,24,30,36
0.10
UIpp
1-3,8,9-14,21,22,24,30,35
0.40
UIpp
1-3,8,9-14,21,22,24,30,36
0.10
UIpp
1-3,8,9-14,21,22,24,30,35
0.06
UIpp
1-3,8,9-14,21,22,24,30,36
0.05
UIpp
1-3,8,9-14,21,22,24,30,35
0.04
UIpp
1-3,8,9-14,21,22,24,30,36
0.03
UIpp
1-3,8,9-14,21,22,24,30,35
0.04
UIpp
1-3,8,9-14,21,22,24,30,36
0.02
UIpp
Jitter at Output for 1Hz 3.00UIpp Input
Jitter at Output for 3Hz 2.33UIpp Input
Jitter at Output for 5Hz 2.07UIpp Input
Jitter at Output for 10Hz 1.76UIpp Input
Jitter at Output for 100Hz 1.50UIpp
Input
Jitter at Output for 2400Hz 1.50UIpp
Input
Jitter at Output for 100kHz 0.20UIpp
Input
* Refer to the Test Conditions on Page 32 for details.
PT0100(08/02)
29
Ver:0
Data Sheet
PT7A4402B/4402L
T1/E1 System Synchronizer
||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
8kHz Input Jitter Tolerance
Table 21. 8kHz Input Jitter Tolerance
Sym
Descr ip t ion
Test C on d it ion s*
Min
Typ
Ma x
Un it s
Jitter Tolerance for 1Hz Input
0.80
UIpp
Jitter Tolerance for 5Hz Input
0.70
UIpp
Jitter Tolerance for 20Hz Input
0.60
UIpp
0.20
UIpp
Jitter Tolerance for 400Hz Input
0.15
UIpp
Jitter Tolerance for 700Hz Input
0.08
UIpp
Jitter Tolerance for 2400Hz Input
0.02
UIpp
Jitter Tolerance for 3600Hz Input
0.01
UIpp
Jitter Tolerance for 300Hz Input
1-3,6,9-14,21,22,24-26,28
* Refer to the Test Conditions on Page 32 for details.
1.544MHz Input Jitter Tolerance
Table 22. 1.544MHz Input Jitter Tolerance
Sym
Descr ip t ion
Test C on d it ion s*
Min
Typ
Ma x
Un it s
Jitter Tolerance for 1Hz Input
150
UIpp
Jitter Tolerance for 5Hz Input
140
UIpp
Jitter Tolerance for 20Hz Input
130
UIpp
Jitter Tolerance for 300Hz Input
35
UIpp
25
UIpp
Jitter Tolerance for 700Hz Input
15
UIpp
Jitter Tolerance for 2400Hz Input
4
UIpp
Jitter Tolerance for 10kHz Input
1
UIpp
Jitter Tolerance for 100kHz Input
0.5
UIpp
Jitter Tolerance for 400Hz Input
1-3,7,9-14,21,22,24-26,29
* Refer to the Test Conditions on Page 32 for details.
PT0100(08/02)
30
Ver:0
Data Sheet
PT7A4402B/4402L
T1/E1 System Synchronizer
||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
2.048MHz Input Jitter Tolerance
Table 23. 2.048MHz Input Jitter Tolerance
Sym
Descr ip t ion
Test C on d it ion s*
Min
Typ
Ma x
Un it s
Jitter Tolerance for 1Hz Input
150
UIpp
Jitter Tolerance for 5Hz Input
140
UIpp
Jitter Tolerance for 20Hz Input
130
UIpp
Jitter Tolerance for 300Hz Input
50
UIpp
40
UIpp
Jitter Tolerance for 700Hz Input
20
UIpp
Jitter Tolerance for 2400Hz Input
5
UIpp
Jitter Tolerance for 10kHz Input
1
UIpp
Jitter Tolerance for 100kHz Input
1
UIpp
Jitter Tolerance for 400Hz Input
1-3,8,9-14,21,22,24-26,30
* Refer to the Test Conditions on Page 32 for details.
OSCi 20MHz Master Clock Input
Table 24. OSCi 20MHz Master Clock Input
Sym
Descr ip t ion
Test C on d it ion s*
Min
15, 18
Ma x
Un it s
0
0
ppm
16, 19
-32
+32
ppm
17, 20
-100
+100
ppm
40
60
%
Rising Time
10
ns
Falling Time
10
ns
Tolerance
Duty Cycle
Typ
* Refer to the Test Conditions on Page 32 for details.
PT0100(08/02)
31
Ver:0
Data Sheet
PT7A4402B/4402L
T1/E1 System Synchronizer
||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Notes:
1. Voltages are with respect to ground (GND) unless otherwise stated.
2. Supply voltage and operation temperature are as per Recommended Operating Conditions.
3. Timing parameters are as per AC Electrical Characteristics - Voltage Levels for Timing Parameter Measurement.
Test Conditions:
1. PRI reference input selected.
2. SEC reference input selected.
3. Normal State selected.
4. Holdover State selected.
5. Free-Run State selected.
6. 8kHz frequency source selected.
7. 1.544MHz frequency source selected.
8. 2.048MHz frequency source selected.
9. Master clock input OSCi at 20MHz ±0ppm.
10. Master clock input OSCi at 20MHz ±32ppm.
11. Master clock input OSCi at 20MHz ±100ppm.
12. Selected reference input at ±0ppm.
13. Selected reference input at ±32ppm.
14. Selected reference input at ±100ppm.
15. For Free-Run State of ±0ppm.
16. For Free-Run State of ±32ppm.
17. For Free-Run State of ±100ppm.
18. For capture range of ±230ppm.
19. For capture range of ±198ppm.
20. For capture range of ±130ppm.
21. 25pF capacitive load.
PT0100(08/02)
22. OSCi Master Clock Jitter is less than 2ns p-p, or 0.04UI
p-p where 1UI p-p = 1/20MHz.
23. Jitter on reference input is less than 7ns p-p.
24. Applied jitter is sinusoidal.
25. Minimum applied input jitter magnitude to regain synchronization.
26. Loss of synchronization is obtained at slightly higher input jitter amplitudes.
27. Within 10ms of the state, reference or input change.
28. 1UIpp = 125µs for 8kHz signals.
29. 1UIpp = 648ns for 1.544MHz signals.
30. 1UIpp = 488ns for 2.048MHz signals.
31. 1UIpp = 324ns for 3.088MHz signals.
32. 1UIpp = 244ns for 4.096MHz signals.
33. 1UIpp = 122ns for 8.192MHz signals.
34. 1UIpp = 61ns for 16.384MHz signals.
35. No filter.
36. 40Hz to 100kHz bandpass filter.
37. With respect to reference input signal frequency.
38. After a RST or TCLR.
39. Master clock duty cycle 40% to 60%.
40. Prior to Holdover State, device was in Normal State and
phase locked.
32
Ver:0
Data Sheet
PT7A4402B/4402L
T1/E1 System Synchronizer
||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Mechanical Specifications
Figure 19. 28-pin PLCC
PT0100(08/02)
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Data Sheet
PT7A4402B/4402L
T1/E1 System Synchronizer
||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Note
Pericom Technology Inc.
Email: [email protected]
Web-Site: www.pti.com.cn, www.pti-ic.com
China:
No. 20 Building, 3/F, 481 Guiping Road, Shanghai, 200233, China
Tel: (86)-21-6485 0576
Fax: (86)-21-6485 2181
Asia Pacific:
Unit 1517, 15/F, Chevalier Commercial Centre, 8 Wang Hoi Rd, Kowloon Bay, Hongkong
Tel: (852)-2243 3660
Fax: (852)- 2243 3667
U.S.A.:
2380 Bering Drive, San Jose, California 95131, USA
Tel: (1)-408-435 0800
Fax: (1)-408-435 1100
Pericom Technology Incorporation reserves the right to make changes to its products or specifications at any time, without notice, in order to
improve design or performance and to supply the best possible product. Pericom Technology does not assume any responsibility for use of any
circuitry described other than the circuitry embodied in Pericom Technology product. The company makes no representations that circuitry
described herein is free from patent infringement or other rights, of Pericom Technology Incorporation.
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